Author Topic: Capacitor Esoterica  (Read 190 times)

Online abstruse1

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Capacitor Esoterica
« on: May 03, 2022, 11:36:31 PM »
Working with voltage multipliers, the condition of capacitors is very important.  They croak from time to time, and I want to make sure that simply testing the capacitance (e.g. 100 mF) is adequate to spot defective ones.

I bought a Peak Atlas LCR45 meter, and it gives info about the capacitor under test, but I can't find out what the parameters mean and if they can help diagnose a defective cap.  The parameters are impedance, admittance, and mag/phase.

Do I need to use any of these for diagnosis, and if so, how can I tell what good values are (other than by comparison with a new cap)?
« Last Edit: May 03, 2022, 11:38:08 PM by abstruse1 »
Abstruse1
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Offline klugesmith

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Re: Capacitor Esoterica
« Reply #1 on: May 04, 2022, 05:42:23 PM »
Does your LCR45 meter have a knob to choose the test frequency?  What's its range?
The parameters you listed are all very strongly frequency-dependent.
Please start with one capacitor under test. It will be educational to measure and chart those parameters across the frequency range.

I bet they won't show much about which individual capacitors are likely to fail in high stress operation.  Not more than basic capacitance measurement at one reasonable frequency.

Offline johnf

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Re: Capacitor Esoterica
« Reply #2 on: May 04, 2022, 11:22:09 PM »
When i'm repairing Glassman HV PSU's I test all the multiplier stack capacitors individually at their rated DC voltage looking for leakage I have a Danbridge JP30A to do this with
https://www.danbridge.com/product_detail.php?indexs=46
without this I have never found a problem at low voltage measurements ie they measure within tolerance but at elevated voltage the leakage is way out of spec

Online abstruse1

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Re: Capacitor Esoterica
« Reply #3 on: May 07, 2022, 05:57:22 PM »
Kluge, I'm using two capacitance meters.  One's a Peak LCR45 that has an automatic parameter selection feature, as well as the ability to choose parameters such as frequency. These are its frequencies: Automatic or manual test frequency, DC, 1kHz, 15kHz or 200kHz. The other is Proster BM4070 that doesn't offer any choices.  My experience with Peak meters (different kinds) suggests that the automatic setting works well.
Abstruse1
   Been working with electricity for 60 years and still getting a tingle!

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Re: Capacitor Esoterica
« Reply #3 on: May 07, 2022, 05:57:22 PM »

 


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